Seconds From Disaster

Tornado Outbreak (3x17)

: 02, 2007

On 3 April 1974, the most violent outbreak of tornadoes in history struck. The well-named "Super Outbreak" produces 148 twisters over 13 American states and in Ontario, Canada destroying thousands of homes and over 5,000 people die. How did a single storm form the 1974 "Super Outbreak" tornadoes?